Rotary oil pump



July 13, 1943. G. SIVERTSEN 2,324,116

ROTARY OIL PUMP Filed March 26, '1941 Fical.

A AT RNEY Patented July 13, 1943 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to rotary pumps, and more particularly to a novelcompact multiple pump structure for supplying an oil burner with a.predetermined mixture of air and oil.

In accordance with the invention I provide a compact sectional casinghaving spaced connected chambers, housing a gear pump and an im pellerunit. The gear pump and the impeller unit are used to respectively andsuccessively mix and atomize suitable proportions of oil and air, in twostages. The oil is supplied to the gear pump by gravity feed through anexternal controllable valve. The use of an oil sump is renderedsuperfluous. The pump of the invention contains no restricted passagesor needle valves, avoiding the danger of clogging.

Prior pump units for oil burners employed a special pump to feed the oilfrom a reservoir to an oil sump. The oil in the sump was drawn up byanother pump which also mixed it with a suitable proportion of air. Thethus obtained mixture of oil and air was atomized by an impeller anddischarged through a burner nozzle. A pump was required for returningthe oil into the reservoir.

It is among the objects of the invention to provide a novel compactmultiple pump structure of simple construction which operates without anoil sump.

Another object of the invention is to provide an oil burner pump with norestricted passages or needle valves that are likely to clog up.

Still another object of the invention is to provide a novel pump unitfor oil burners containing a gear pump for initially admixing the oiland air, and an impeller pump for'atomizing the mixture of oil and air.

These and further objects of the invention will become apparent in thefollowing description of preferred embodiments thereof illustrated inthe drawing, wherein:

Figure 1 is a longitudinal vertical section of a pump unit in accordancewith the invention.

Figure 2 is a transverse section taken along the line 2-2 of Figure 1,showing the gear pump used for mixing oil and air.

Figure 3 is a transverse section taken along the line 33 of Figure 1.,showing the impeller unit for atomizing the mixture of oil and air.

Referring to the drawing. my novel pump structure comprises bed plate ihaving rigidly mounted thereon the sectional pump casing. The casingcomprises a plurality of disk and housing sections. The housing sectionsare open on both sides, while the disk section abuts the sides of thehousing sections, greatly facilitating its con struction and assembly.The pump casing comprises disk sections l3 and i5 and housing sectionsl2 and I4.

The oil is preferably supplied to the pump by gravity feed from the tankindicated at It. Pipe line I! connects tank It with duct l3 boredthrough disk section l. A magnetically operated valve l9 and anadjusting needle valve 2!] are arranged in pipe line H, both valvesbeing schematically indicated in the drawing.

Duct 18 in disk section I! is connected with oil nozzle 2|. Oil nozzle2| extends through air passage 22 provided in disk section H to space 23provided in the mixing chamber 24. Mixing chamber 24 is arranged inhousing section l2. Space 23 and air passage 22 are connected by channel25, bored. through disk section II. A timing gear pump comprising twogears 26 and 21 i arranged in mixing chamber 24. Timing gear 26 is keyedto main shaft 28 and timing gear 2! is secured to shaft 29. Timing gearpump 26, 21 sucks in the air through air passage 22 and mixes it withthe oil taken up by the passing air from oil nozzle 2|.

Passage 30 in disk section |3 is connected with mixing chamber 24 aswell as with conduit 3| in disk section l4 to impeller chamber 32.Impeller chamber 32 houses a pair of meshing impeller units 33, 34, eachpreferably having two blades. Impeller 33 is keyed to the main shaft 28.Impeller 34 is secured to shaft 29. Conduit 35 in housing section |4connects impeller chamber 32 with pipe 36 connected with oil nozzle 31.Oil

' nozzle 31 is arranged with the burner or furnace,

not shown in the drawing, directly supplying the combustible mixturthereto.

Main shaft 28 is connected with drive shaft 4|] and electric motor 4| byflexible coupling 38. Motor 4| is fastened onto bed plate l0. Bearing 42is arranged in a projecting hub of disk section l5, for main shaft 28.An oil collecting chamber 43 is provided behind bearing 42. Channel 44communicates from impeller chamber 32 to shaft 28 at its bearing,affording suitable lubrication for the bearing. The oil is directed tocollecting chamber 43 and returned to impeller chamber 32 throughconduit 45.

In practice, the operation of my simplified oil pump is as follows: Oilfrom tank I 6 reaches nozzle 2| by gravity feed in a regulated manner.The regulation of the oil flow is through magnetically operated valve l9and adjustable through needle valve 20. Motor 4| rotates shaft 28through flexible coupling 38. Gear 26 keyed to shaft 28 meshes with gear21 which, in turn, drives shaft 29. Thus, gears 26 and 2! ensure thetimed rotation of impeller blades 33, 34.

Continuous rotation of timing gear-pump 26, 21 draws in the air frompassage 22 which, in turn, takes up the oil from nozzle 2|. The airpassage through channel 25 is concentric about the oil flow, and bothreach mixing chamber 24 together. It is to be understood that the airflow to mixing chamber 24 may be independently regulated. The gears 26,21 pulverize the oil for a first stage admixture with the air. Theadmixed oil and air are thereupon forced into impeller chamber 32 foratomizing action by impeller 33, 34. The mixture of oil and air isatomized into the proper combustible mixture for the furnace andimpelled to fuel nozzle 31 through opening 35.

Various changes and modifications may be made to the details ofconstruction of the inven tion without departing from the broader spiritand scope thereof, as set forth in the following claim.

I claim:

A pumping unit for oil burners comprising a sectional casing, embodyinga mixing chamber, a mixing pump located therein, an atomizing chamber,an atomizing pump therein, means for operating the two pumps in timedrelation, an air inlet, including a vertical portion connectable to asource of air supply, and a horizontal portion communicating with saidmixing chamber below the pump therein, an oil nozzle concentricallydisposed within the horizontal portion of said inlet and extendingtherethrough into said mixing chamber, in proximity to said mixing pump,whereby the oil issuing from said nozzle will be subjected to the actionof the surrounding stream of air in its introduction to said mixingchamber, a passage leading from the top of said mixing chamber,including a horizontal portion merging into a vertical portion, parallelwith the vertical portion of said inlet, a second horizontal portionparallel to the base of the unit merging into a vertical portion openinginto th atomizing chamber beneath the atomizing pump, a verticallydisposed discharge outlet leading from the top of the latter chamber anda fuel nozzle connected to said outlet, the defining surfaces of saidpassages to said mixing chamber and between the latter and the atomizingchamber, together with those of the two chambers and said dischargeoutlet, being uninterrupted and constituting a continuous closedconduit, wholly contained within said casing, to conduct the fluidsthrough the casing for discharge therefrom into the fuel nozzle, in theultimate combustible mixture, in a constant unidirectional movement fromsaid inlet to said outlet.

GUDMUND SIVERTSEN.

